BuildDynamicGetterUnrolled.cs

public static Func<object, object> BuildDynamicGetter(ClosureField field)
{
    // Create a new dynamic method
    FieldInfo[] hierarchy = field.Parents.Append(field.Info).ToArray();
    Type ownerType = hierarchy[0].DeclaringType;
    DynamicMethod method = new DynamicMethod(
        $"Get{field.Info.Name}",
        typeof(object),             // The return type
        new[] { typeof(object) },   // A single object parameter
        ownerType);                 // The type that will own the new method

    // Load and cast the argument
    ILGenerator il = method.GetILGenerator();
    il.Emit(OpCodes.Ldarg_0);
    il.Emit(OpCodes.Castclass, ownerType);

    // Unroll the depth traversal until the last parent
    foreach (FieldInfo parent in field.Parents)
    {
        il.Emit(OpCodes.Ldfld, parent);
    }

    // Get the target field
    il.Emit(OpCodes.Ldfld, field.Info);
    if (field.FieldType.IsValueType)
    {
        il.Emit(OpCodes.Box, field.FieldType);
    }
    il.Emit(OpCodes.Ret);

    // Create the proper delegate type for the method
    return (Func<object, object>)method.CreateDelegate(typeof(Func<object, object>));
}